At the theme park were some adults.
12 of the number of locals was equal to 2 times the number of tourists. When another 8 tourists entered and 28 locals left, the ratio of the number of locals to the number of tourists become 8 : 3. Find the number of locals at the theme park at first.
|
Make p the same (1)x3 = (3) |
Locals (1) |
Tourists (2) |
Make p the same (2)x8 = (4) |
Before |
12 u |
4 u |
1 u |
8 u |
Change |
- 84 |
- 28 |
+ 8 |
+ 64 |
After |
24 p |
8 p |
3 p |
24 p |
12 of the locals = 2 times of the tourists
1x22x2 of the locals =
2x11x1 of the tourists
Make the numerators the same. LCM of 1 and 2 is 2.
24 of the locals =
21 of the tourists
Locals : Tourists = 4 : 1
Make p the same.
(3) = (4)
12 u - 84 = 8 u + 64
12 u - 8 u = 64 + 84
4 u = 148
1 u = 148 ÷ 4 = 37
Number of locals at the theme park at first
= 4 u
= 4 x 37
= 148
Answer(s): 148